Postman is a popular API testing tool that helps developers and testers design, test, and manage APIs. It simplifies the process of making HTTP requests and validating responses.

GET requests are used to retrieve data from the server, while POST requests are used to send data to the server, often for creating new resources or triggering actions.

You can export collections by clicking on the three dots next to a collection and selecting Export. To import a collection, click Import and select a file (JSON format).

API (Application Programming Interface) is a set of rules that allows one software application to interact with another. It defines the methods and data structures that applications use to communicate.

Common HTTP status codes include:

Postman allows you to send HTTP requests (GET, POST, PUT, DELETE, etc.) to a server, view the responses, and analyze the data returned. It also supports adding headers, parameters, and authentication for API calls.

Variables in Postman are placeholders that can be used in the URL, headers, or body of requests. They allow for dynamic data substitution and make it easier to manage different environments and data sets.

An environment in Postman is a set of variables that can be used to manage different configurations or sets of values, such as development, testing, and production environments.

The Collection Runner in Postman is used to execute all requests in a collection, with the ability to repeat requests multiple times with different sets of data from a CSV or JSON file.

Pre-request scripts are executed before sending a request. They can be used to modify variables, set up authentication, or perform other tasks that need to happen before a request is sent.

Postman supports various authentication mechanisms, such as Basic Auth, OAuth 1.0 & 2.0, Bearer Token, and API keys. These can be configured in the Authorization tab of the request.

You can add query parameters in the URL or use the Params tab in Postman to specify key-value pairs. For body parameters, use the Body tab and select the appropriate format (e.g., JSON, form-data).

The Postman Runner allows you to run a collection of requests in sequence. It can also execute tests, track results, and handle multiple iterations with varying data sets (data-driven testing).

Global variables are available across all collections and environments, whereas environment variables are specific to a particular environment and can override global variables when selected.

You can write tests in the Tests tab of a request. Postman uses JavaScript syntax to write assertions like pm.test() and pm.expect(). For example, pm.test("Status code is 200", function() { pm.response.to.have.status(200); });

You can use the Tests tab in Postman to write scripts that check the response status, response time, response body, headers, and other aspects of the API’s response to ensure it meets your expectations.

Postman allows you to write tests in JavaScript to automate the validation of API responses. You can check for specific values, status codes, and headers to ensure the API behaves as expected.

Postman supports WebSocket requests, enabling you to establish a WebSocket connection, send messages, and receive data in real-time. You can manage WebSocket requests through the New Request option in the Postman interface.

Newman is a command-line collection runner for Postman. It allows you to run Postman collections directly from the command line and integrate them into automated testing pipelines.

The Postman Console is a debugging tool that logs all request and response details, including headers, body, and scripts. It helps identify errors in the request or response flow.

You can automate API tests in Postman by using Collection Runner or Newman (Postman’s command-line tool). With Newman, you can run collections from the command line and integrate them into CI/CD pipelines.

Postman Monitor allows you to run collections at scheduled intervals in the cloud, enabling you to track API performance and uptime over time. It provides detailed reports and notifications.

In Postman, you can select the GET method from the dropdown menu, enter the request URL, and click Send to make the API request. The server's response will be displayed in the Postman interface.

Key features of Postman include sending HTTP requests, validating API responses, automation with test scripts, collections for organizing requests, and environment variables for parameterization.

A Postman Collection is a group of API requests that are organized and stored together. Collections can be exported, shared, and reused, which helps in organizing test scenarios and workflows.